Spurious vector register, Timer frequency register – Motorola MVME2300 Series User Manual
Page 147
Raven Interrupt Controller
http://www.motorola.com/computer/literature
2-77
2
Spurious Vector Register
VECTOR Interrupt Vector. This vector is returned when the
Interrupt Acknowledge register is read during a spurious
vector fetch.
Timer Frequency Register
This register is used to report the frequency (in Hz) of the clock source for
the global timers. Following a reset, this register contains zero. For the
Raven implementation of MPIC on the MVME2300 series, this register
must be written with a value of $7DE290 (that is, 66/8 MHz or 8.25 MHz),
which corresponds to a 66MHz MPC bus.
Offset
$010E0
Bit
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0 9 8 7 6 5 4 3 2 1 0
Name
VECTOR
Operation
R
R
R
R/W
Reset
$00
$00
$00
$FF
Offset
$010F0
Bit
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0 9 8 7 6 5 4 3 2 1 0
Name
TIMER FREQUENCY
Operation
R/W
Reset
$00000000